Historically broadly distributed in western North America. Bombus occidentalis occurs along the Pacific coast and western interior of North America, from Arizona, New Mexico and California, north through the Pacific Northwest and into Alaska. Eastward, the distribution stretches to the northwestern Great Plains and southern Saskatchewan.
This weekend, BUGfest will celebrate the western bumble bee
Bumble Bees of Alaska: A Field Guide (U.S. National Park Service)
Western bumblebee on goldenrod in the Wallowa Mountains in Oregon
Western Bumble Bee - Extinction
Species Illustrations - PNW Bumble Bee Atlas
Bumble Bees
Species Illustrations - PNW Bumble Bee Atlas
IBP - Blog Post
COSEWIC Assessment and Status Report on the Western Bumble Bee
cloudfront-us-east-1.images.arcpublishing.com/opb/
20+ Western Bumble Bee Bombus Occidentalis Stock Photos, Pictures & Royalty-Free Images - iStock
Bumble Bee Removal & Control in Western NY